<?phpclass IndexAction extends Action{    public function execute ()    {        // we don't need any data here because this action doesn't serve        // any request methods, so the processing skips directly to the view    }    public function getDefaultView ()    {        if(is_file('../data/install.lock')){            header("Content-type: text/html;charset=utf-8");                    echo"<script language='javascript'>" .                        "alert('已经成功安装了laiketui，请不要重复安装!');" .                        "location.href='../index.php';</script>";                    return ;        }        $type = true;        $num = 0;        $_SESSION['install_error'] = $type;        $this->getContext()->getStorage()->write('step',$num);        return View::SUCCESS;    }    public function getRequestMethods ()    {        return Request::NONE;    }}?>